London, April 13, 2026, 13:06 BST
On Monday, Europe’s spot crude market spiked—North Sea Forties crude shot up to a record $148.87 a barrel—as the U.S. made good on its warnings to Iran. U.S. stock futures slipped after a notice to mariners confirmed the blockade on Iranian port traffic would kick in at 1400 GMT. Brent futures, meanwhile, pushed past $100 again.
This development ripples far past energy markets. About 2 million barrels per day of Iranian crude could be sidelined after the weekend’s Islamabad talks broke down, and the current two-week ceasefire runs out April 22. Inflation is creeping back into focus, too, with U.S. annual consumer inflation hitting 3.3% in March—the sharpest monthly increase seen in almost four years.
Brent futures jumped 7.2%, hitting $102.01 a barrel in late London trading, while U.S. West Texas Intermediate surged 7.8% to $104.07. The physical market, though, sent an even sharper signal as refiners scrambled for near-term cargoes. “Physical transactions were under a lot of strain,” Repsol CEO Josu Jon Imaz said. Reuters
Reuters reviewed a note to seafarers outlining that the blockade will cover the Gulf of Oman and the Arabian Sea, east of Hormuz, and apply to every vessel, flag notwithstanding. Ships entering or leaving without clearance risk being stopped, redirected, or seized. Still, according to the U.S. military, neutral traffic passing through Hormuz on its way to non-Iranian ports shouldn’t face obstruction.
Tehran slammed potential U.S. restrictions on ships in international waters, calling them illegal, and warned that threats to Iranian ports would put every Gulf and Gulf of Oman harbor at risk. Negotiations stalled—Washington held firm, insisting Iran give up its enriched uranium, stop all further enrichment, and cease backing its allies in the region. Iran, for its part, pushed for sanctions relief and recognition of its control over the strategic waterway.
The pressure on shipping was clear. On Monday, Reuters said two tankers tied to Iran left the Gulf, as more ships started steering clear of the strait—that’s the route for nearly 20% of global oil. Usually, Iranian cargoes head for China; India has only just started buying again.
Dow E-minis slipped 0.54% ahead of the bell, with S&P 500 E-minis down 0.63% and Nasdaq 100 E-minis off 0.65%. The VIX moved up to 21.32. Chevron and Exxon Mobil ticked higher before the open, but Delta Air Lines dropped as renewed fuel-cost concerns set in before the first-quarter U.S. earnings season.
Analysts saw the market snap from ceasefire optimism straight into pricing for new risks. SEB’s Erik Meyersson said the blockade made the truce’s basic logic “untenable for now.” William Blair’s Richard de Chazal argued the escalation put extra heat on Iran’s partners to steer Tehran back toward a deal. Over at Tellimer, Hasnain Malik said investors were again bracing for anything—from renewed negotiations to outright conflict. Reuters
Europe is already taking steps to respond. European Commission President Ursula von der Leyen called the restoration of freedom of navigation through Hormuz “paramount,” urging member states to coordinate after the bloc’s fossil-fuel costs jumped by 22 billion euros since the conflict started. Britain broke ranks, refusing to back the U.S. blockade, saying its priority is to get the passage open again. Reuters
Even so, the impact won’t land evenly. Saudi Arabia claims its East-West pipeline—Hormuz’s main workaround—is back at full strength, running near 7 million barrels per day. Earlier this month, Kpler data cited by Reuters put more than 180 million barrels of Iranian oil still sitting on the water. Those supply cushions and alternate routes can soften the initial blow, but they won’t wipe it out.
There’s a bigger headache here: the disruption could drag on far longer than traders were betting just a week back. Dana Stroul, who previously served as a senior Pentagon official and now works at the Washington Institute for Near East Policy, pointed out that Washington would struggle to maintain the blockade by itself. Morgan Stanley, meanwhile, has stuck with its Brent projection at $110 for the second quarter, warning that supply chains might need months to return to normal, even with a reopened strait. The upshot? Oil, shipping, and stock markets are bracing for a drawn-out squeeze—not a fast diplomatic off-ramp.
